Safety device for mine cages



Sept. 7 1926.

' 1,598,734 J. LICHTENBERG v SAFETY DEVICE FOR M'I'N'E CAGES Ill [III III LJ/ 5 w 1 M A 2L h t I E 0 u I A Z 1 Quit/11111111111111 11/1 W1 I n 9.5.5155 m wzmw 3 6m) wan l5 Patented Sept. 7, 1926. t

UNITED STATES JAKOB LIGHTENBERG, OF BERGISCI-I-GLADIBACH, GERMANY.

SAFETY nnvrcn non M nn cases.

This invention relates to an improved safety-device for mine cages, of the type in which by means of a spring-pressed frictionroller screwspindles having right-and lefthand screw-threads are operated for pressing the braking-jaws upon the guide-beams.

The novely of the improvement consists in the fact that the friction-roller with stretched suspension-rope of the cage is held in its lifted position by means of turnable claws engaging below the fork of the friction-roller and which are adjusted in horizontal position by erect-ion of their anglelevers connected with said rope, while with unstretched or torn rope they are turnedover and thus liberate said fork which is acted-upon by a spring. Said fork acts upon locking pawls connected therewith by links and which engage with the toothing of fixed brackets on the cage.

By supporting the fork connecting the riction-roller with the operating spring, by means of said claws of which the position depends upon the stretching condition of the rope of the cage, the effectalready known in connection with similar safety-devices but obtained by difierent meansis attained that the friction-roller is prevented from being brought into its operative position by the normal rope vibrations only.

By means of the locking-pawls engaging with said toothing, it is attained that the frictionroller, upon being brought in contact with its guiding-race, is locked in this position.

The invention consists in attaining said two effects at a time by the fork connecting the friction-roller with the operating spring being locked by means of said angle-levers connected with the rope of the mine cage and allowing, at its movement following the disengagement of said locking action, pawls to engage in fixed toothings which prevent the friction-roller returning from its engaged position.

The accompanying drawing illustrates the improved arrangement: Fig. 1 is a sectional side view, on the line AB of Fig. 4, of the improved safety-device in its inoperative position, Fig. 2 is a similar view to the former showing the safety-device in its operative position, and Figs. 3 and 4 are respectively a front view and a plan view of the improved arrangement.

The trictionwoller 1 t lrns on a shaft .2

Serial No. 48,351.

mounted in two supports 3 which are turnably arranged on a cylindrical nut 4. The latter, when turned, moves two right-and left-hand screw-spindles 5, 6 for pressing the breaking-jaws 7 against the guide-beams 8. The driving of the nut 4 is effected by means of a spur-wheel 9 keyed on the nut 4 and in gear with a toothed-wheel 10 integral with the friction-roller 1. The latter is acted upon by a pressure-spring 11 with which it is connected by means of the fork 12 attached to the shaft 2.

lVith stretched rope 18, the friction-roller 1 is inits lifted position in which it is locked by means of claws 14 turnable in brackets 13 and engaging below catches 15 of the fork 12. The angle-levers 14 rigidly con nected with the claws 14 at about a right angle are in connection with the cage rope 18 by means of chains 16 attached to a common strap 17 fixed to the rope 18. With stretched rope, thus, the claws 14 are held in horizontal position. lVith vibrations in the stretching of the rope not exceeding a certain normal limit, thus, the friction-roller 1 is held out of engagement with the guiding-race 19 as is known in the art.

With unstretched or torn rope 18, how ever, the supports for the fork 12 are done away by the claws 14 being free to turnover. Consequently, the fork 12 is pulled down by action of the spring 11 until the friction-ro1ler 1 makes contact with its guiding-race 19. Said contact is maintained in a way known in the art by the frictionroller 1 being locked in its lowered posi tion by means of pawls 20 pivoted at one end to the supports 3 and connected at the other end by links 21 with the fork 12. Said pawls engage by action of the spring 11 in the toothing 22 of fixed brackets 22 on the cage and prevent the friction-roller 1 returning to its inoperative position, said roller being then turned by its contact with the guiding-race 19 and thus turning the nut 4 for operating the braking-jaws 7.

What I claim, is:

In combination, a mine cage, breakingjaws thereon, a driving friction-roller normally held in its inoperative position, a screw-gearing adapted to operate said breaking-jaws upon disengagment of said frictioirroller from its inoperative osition, a spring-pressed fork attached to t 1e shaft of ass. roiler and ade pa-d to hold the atter in its inoperative as Well as in its operative tion-roller in its operative position, substanpositions; catches on said fork, a suspenslontially as set forth.

rope for the mine cage, turnable claws en- In testlmony whereof I have hereunto set 10 gaging with said catches with stretched rope my hand in the presence of two subscribing to which said claws are attached, and lockwitnesses i ing-pawls adapted to be operated with mstretched or torn rope and to lock said fric- JAKOB LICHTENBERG. 

